CN201846340U - Portable underwater acoustic communication device for frogman - Google Patents
Portable underwater acoustic communication device for frogman Download PDFInfo
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Abstract
The utility model discloses a portable underwater acoustic communication device for a frogman, which is capable of simultaneously solving the problems of signal detection, user identification and rough synchronism of multi-user underwater communication by the aid of synchronous duplex pulse consisting of linear frequency-modulation pulse and chaos frequency-modulation and phase-modulation pulse, not only ensures instantaneity of signal detection but also ensures accuracy of multi-user identification and synchronism by the aid of a duplex-pulse combination, and realizes multi-user grouped M-ary spread-spectrum communication by the aid of chaos frequency-modulation and phase-modulation spread-spectrum signals. As the chaos frequency-modulation and phase-modulation spread-spectrum signals are orthogonal mutually and the number of the signals capable of being transmitted simultaneously is large, mutual interference of demodulation in multi-user communication can be reduced effectively, and communication efficiency and performance of multi-user underwater sound communication can be improved effectively. Besides, the portable underwater acoustic communication device is convenient for the frogman to carry.
Description
Technical Field
The utility model belongs to portable communication sonar equipment field, in particular to utilize chaos frequency modulation phase modulation sequence to carry out communication modulation and demodulation method's of grouping M yuan spread spectrum multi-user communication sonar equipment and method. The utility model discloses mainly used dive operation frogman's well short range real-time communication under water.
Background
When frogman is diving, the communication modes that are commonly used mainly have two kinds: one is sign language, but the underwater visual range is small, so the communication distance is limited; the other is wired mode, and due to the limitation of cables, on one hand, the communication distance is limited, and on the other hand, the frogman operation is also influenced. Therefore, frogmans need a wireless communication method to meet the problem of underwater communication. Because sound waves are the only medium under water that can propagate remotely, communications sonar is an effective way to solve the frogman communication problem. However, the conventional communication sonar is not suitable for frogmans to carry due to its large size. While some of the U.S. patents (Earl Kent Hunter, etc., over communication system, P3789353; lvan Gardos, etc., Integrated two face mask and ultrasound communication apparatus, P5136555) adopt an ultrasonic single-sideband communication mode, which has limited communication distance and communication bandwidth and cannot meet the requirement of simultaneous communication of multiple users. The utility model discloses utilize chaos frequency modulation phase modulation sequence to carry out grouping M yuan spread spectrum multi-user communication, the portable underwater acoustic communication sonar equipment of design not only can satisfy the frogman and the requirement of real-time communication between surface of water base, frogman and the frogman, can satisfy the requirement of multi-user simultaneous communication moreover.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a frog is with portable underwater sound communication equipment and method, utilize chaos frequency modulation phase modulation sequence to carry out grouping M first spread spectrum multi-user communication, satisfy short range real-time communication's portable communication sonar equipment and method among the underwater frog. The utility model discloses a dipulse detects, user identification and synchronization method and based on chaos frequency modulation phase modulation sequence's grouping M first spread spectrum modulation and multi-user detection demodulation method, accomplishes the two-way half-duplex real-time pronunciation of well short range and message communication between the frogman and between frogman and the surface of water base.
In order to solve the technical problem, the utility model provides a following technical scheme: a portable underwater acoustic communication apparatus for frogman, comprising a data input device, a communication transmitting device, a communication receiving device, a data output device, and power and interface devices connected to the respective devices, wherein: the data input device collects voice signals, the voice signals are sent to the communication transmitting device after being compressed and coded, the communication transmitting device converts the received signals into acoustic signals and sends the acoustic signals to the underwater sound channel, the acoustic signals in the underwater sound channel are collected by the communication receiving device and then converted into electric signals to be sent to the data output device, and the data output device converts the electric signals and plays the electric signals through an earphone.
As the utility model discloses a frogman is with a preferred scheme of portable underwater sound communication equipment, wherein:
the data input device comprises a microphone, an audio encoder and a control module, the audio encoder performs real-time lossless voice compression encoding on voice signals collected by the microphone and sends the voice signals to the communication transmitting device, and the control module sets instructions through a knob to control the communication transmitting device;
the communication transmitting apparatus includes: the device comprises a parameter selector, a user mapper, a data coder, a data packetizer, a chaotic sequence generator, a chaotic mapper, a chaotic modulator, a synchronous pulse generator, a waveform generator, a transmission conversion and control module, a matching network, a power amplifier and a transceiving co-located transducer; the parameter selector selects the frequency band and the data rate matched with the type of the transmitted information according to the instruction provided by the control module, and the frequency band and the data rate are respectively provided for the user mapper and the data encoder; the user mapper selects the chaotic parameters matched with the user according to the parameters provided by the parameter selector and sends the chaotic parameters to the chaotic mapper and the chaotic sequence generator; the data encoder performs source coding and channel coding on the message instruction provided by the control module or the voice data provided by the audio encoder according to the parameters provided by the parameter selector; the data packetizer packetizes the data stream sent by the data encoder and sends the data stream to the chaotic modulator; the chaotic sequence generator generates chaotic sequences determined by different initial values through a chaotic mapping equation according to parameters provided by a user mapper and sends the chaotic sequences to the chaotic mapper and the synchronous pulse generator; the chaotic mapper maps the chaotic sequence generated by the chaotic sequence generator according to the parameters provided by the user mapper to generate a chaotic frequency modulation value sequence mapping packet and a chaotic phase modulation value sequence mapping packet which are orthogonal to each other and send the packets to the chaotic modulator; the chaotic modulator carries out grouped M-element chaotic spread spectrum modulation according to the chaotic frequency modulation value sequence mapping grouping and the chaotic phase modulation value sequence mapping grouping provided by the chaotic mapper, modulates the data grouping provided by the data grouper into a transmission data block and sends the transmission data block to the waveform generator; the synchronous pulse generator generates synchronous double pulses consisting of linear frequency modulation pulses and chaotic frequency modulation phase modulation pulses according to a user synchronous chaotic sequence provided by the chaotic sequence generator and sends the synchronous double pulses to the waveform generator; the waveform generator combines the transmitting data block provided by the chaotic modulator and the synchronous double pulses provided by the synchronous pulse generator to generate a final communication transmitting signal, and sends the final communication transmitting signal to the transmitting conversion and control module; the transmission conversion and control module carries out digital-to-analog conversion and transmission conditioning on the communication transmission signal and sends the analog transmission signal and the transmission parameters to the matching network and the power amplifier; the matching network and the power amplifier are driven by the transmission conversion and control module to amplify and match the power of the analog transmission signal; the receiving and transmitting co-located transducer is positioned at the upper part of the cylindrical slender watertight tank, converts an analog transmitting signal into an acoustic signal under the drive of the matching network and the power amplifier and transmits the acoustic signal to an underwater acoustic channel;
the communication receiving device comprises a transceiving transducer, a pre-filtering and amplifying device, an analog/digital converter, a synchronous detector, a synchronous pulse generator, a chaotic sequence generator, a copy generator, a channel equalizer, a chaotic demodulator and a data decoder; the receiving and transmitting co-located transducer is responsible for acquiring underwater acoustic data, carrying out sound-electricity conversion and sending the underwater acoustic data to the pre-filter and amplifier; the pre-filter and amplifier filters and amplifies the analog receiving signal and sends the analog receiving signal to the analog-to-digital converter; the analog/digital converter converts an analog receiving signal into a digital signal and sends the digital signal to the synchronous detector; the chaotic sequence generator generates chaotic sequences which are possibly used by all users in a channel through a chaotic mapping equation and sends the chaotic sequences to the replica generator and the synchronous pulse generator; the synchronous pulse generator generates a multi-user synchronous double-pulse copy consisting of linear frequency modulation pulses and chaotic frequency modulation phase modulation pulses according to a multi-user synchronous chaotic sequence provided by the chaotic sequence generator and sends the multi-user synchronous double-pulse copy to the synchronous detector; the synchronous detector detects communication signals according to the multi-user synchronous double-pulse copies provided by the synchronous pulse generator, if the communication signals are detected, the synchronous detector sends data to the channel equalizer after synchronization, and sends corresponding user identifications to the copy generator; the channel equalizer performs channel equalization on the communication signal and then sends the communication signal to the chaotic demodulator; the replica generator generates a corresponding multi-user grouping M-element spread spectrum replica set according to the chaotic sequence provided by the chaotic sequence generator and the user identification provided by the synchronous detector, and sends the set to the chaotic demodulator; the chaotic demodulator performs related demodulation of a chaotic spread spectrum sequence according to data provided by the channel equalizer and a multi-user grouping M-element spread spectrum replica set provided by the replica generator, generates demodulated data and sends the demodulated data to a data decoder; the data decoder decodes the demodulated data to generate receiving information and sends the receiving information to the data output device;
the data output device comprises a user discriminator, a message mapper, an audio coder and an earphone, wherein the user discriminator discriminates data obtained by the communication receiving device, sends voice data to the audio coder and sends message data to the message mapper; the message mapper maps the message data content into a preset voice data stream and sends the preset voice data stream to the earphone for playing; and the audio decoder performs real-time lossless voice compression and decoding on the voice data and sends the decoded voice data stream to the earphone for playing.
As the utility model discloses a frogman is with a preferred scheme of portable underwater sound communication equipment, wherein: the communication transmitting device and the communication receiving device share the chaotic sequence generator, the synchronous pulse generator and the transceiving transducer.
As the utility model discloses a frogman is with a preferred scheme of portable underwater sound communication equipment, wherein: the equipment main part comprises long and thin watertight jar, frogman's face guard and frogman waistband triplex, and the triplex passes through the cable connection, earphone and microphone are installed on frogman's face guard, control module sets up on the frogman waistband, power and interface module set up on long and thin watertight jar, the receiving and dispatching transducer setting is put altogether at the top of long and thin watertight jar.
Compared with the prior art, the utility model has the advantages of as follows:
1. the utility model discloses utilize the synchronous dipulse that comprises linear frequency modulation pulse and chaos frequency modulation phase modulation pulse, can solve multi-user underwater communication's signal detection, user identification and coarse synchronization problem simultaneously, utilize the dipulse combination both to guarantee signal detection's real-time, guaranteed multi-user identification again and synchronous accuracy
2. The utility model discloses utilize chaos frequency modulation phase modulation spread spectrum signal to carry out multi-user and divide into groups M first spread spectrum communication, because mutual quadrature and can send signal figure many between each chaos frequency modulation phase modulation spread spectrum signal, the mutual interference influence of demodulation when can reducing multi-user communication effectively can improve multi-user underwater sound communication's communication efficiency and performance effectively.
3. The utility model discloses an equipment can be equipped with current frogman and combine together, and the frogman of being convenient for carries.
4. The utility model discloses an equipment also is suitable for unmanned submersible vehicle formation under water to use.
5. The utility model discloses a partial technique not only is applicable to among the underwater acoustic communication, still is applicable to among radio communication and the optical fiber communication.
Drawings
Fig. 1 shows a schematic view of a portable underwater acoustic communication device for frogmans.
Fig. 2 shows a block diagram of a frogman portable underwater acoustic communication system.
Fig. 3 shows a schematic diagram of the pulses emitted by a frogman using a portable underwater acoustic communication system.
Fig. 4 shows a timing chart of a chaotic frequency modulation sequence generated by Quadratic mapping.
Fig. 5 shows a chaotic frequency modulation sequence autocorrelation graph generated by Quadratic mapping.
Fig. 6 shows a cross-correlation diagram of chaotic frequency modulation sequences generated by Quadratic mapping.
Fig. 7 shows a diagram of one-dimensional chaotic sequence direct mapping.
Fig. 8 shows a flow diagram of a method of double-pulse user detection and coarse synchronization.
Fig. 9 shows a flow chart of a multi-user packet M-ary spread spectrum demodulation method.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments. Fig. 1 includes a frogman mask 1, a microphone 2, an earphone 3, a cable 4, a data interface module 5, a cylindrical elongated watertight tank 6, a transceiving transducer 7, a battery and power management module 8, an electronic section 9, a frogman belt 10 and a control module 11.
Example 1
The portable underwater acoustic communication device for frogman of underwater middle-short-range real-time communication provided by the embodiment is as shown in fig. 1, and the device main body is composed of three parts, namely a cylindrical long and thin watertight tank 6, a frogman mask 1 and a frogman belt 10. The device can be divided into five parts, namely a data output device, a data input device, a communication transmitting device, a communication receiving device and a power supply and interface device according to the function division. The functional block diagrams of the first four parts are shown in fig. 2. This embodiment will describe the process of the frogman carrying out message communication with the water surface base through the utility model discloses equipment.
The data input device includes: microphone, audio encoder and control module. The microphone is arranged at the lower part of the frogman mask and is shown in figure 1, and is used for collecting frogman voice data; the audio encoder is arranged inside the cylindrical slender watertight tank, performs real-time lossless voice compression encoding on the voice collected by the microphone, and sends the encoded voice to the communication transmitting device; the control module is arranged on a frog belt and is used for setting instructions through a knob to control the communication transmitting equipment.
The communication transmitting apparatus includes: the device comprises a parameter selector, a user mapper, a data coder, a data packetizer, a chaotic sequence generator, a chaotic mapper, a chaotic modulator, a synchronous pulse generator, a waveform generator, a transmission conversion and control module, a matching network, a power amplifier and a transceiving co-located transducer. The chaotic sequence generator, the synchronous pulse generator, the transceiving transducer and the communication receiving device are shared. Except for the co-located transducer, the other modules are inside the cylindrical elongated watertight tank.
The parameter selector selects the frequency band and the data rate matched with the type of the transmitted information according to the instruction provided by the control module, and the frequency band and the data rate are respectively provided for the user mapper and the data encoder. And the user mapper selects the chaotic parameters matched with the user according to the parameters provided by the parameter selector and sends the chaotic parameters to the chaotic mapper and the chaotic sequence generator. And the data encoder performs source coding and channel coding on the message instruction provided by the control module or the voice data provided by the audio encoder according to the parameters provided by the parameter selector. And the data packetizer packetizes the data stream sent by the data encoder and sends the data stream to the chaotic modulator. The chaotic sequence generator generates chaotic sequences determined by different initial values through a chaotic mapping equation according to parameters provided by a user mapper and sends the chaotic sequences to the chaotic mapper and the synchronous pulse generator. The chaotic mapper maps the chaotic sequence generated by the chaotic sequence generator according to the parameters provided by the user mapper to generate a chaotic frequency modulation value sequence mapping packet and a chaotic phase modulation value sequence mapping packet which are orthogonal to each other, and sends the packets to the chaotic modulator. The chaotic modulator carries out grouped M-element chaotic spread spectrum modulation according to the chaotic frequency modulation value sequence mapping grouping and the chaotic phase modulation value sequence mapping grouping provided by the chaotic mapper, modulates the data grouping provided by the data grouper into a transmission data block and sends the transmission data block to the waveform generator. The synchronous pulse generator generates synchronous double pulses consisting of linear frequency modulation pulses and chaotic frequency modulation phase modulation pulses according to a user synchronous chaotic sequence provided by the chaotic sequence generator, and sends the synchronous double pulses to the waveform generator. The waveform generator combines the transmitting data block provided by the chaotic modulator and the synchronous double pulses provided by the synchronous pulse generator to generate a final communication transmitting signal, and sends the final communication transmitting signal to the transmitting conversion and control module. The transmission conversion and control module carries out digital-to-analog conversion and transmission conditioning on the communication transmission signal and sends the analog transmission signal and the transmission parameters to the matching network and the power amplifier. The matching network and the power amplifier are driven by the transmission conversion and control module to amplify and match the power of the analog transmission signal. The receiving and transmitting co-located transducer is positioned at the upper part of the cylindrical slender watertight tank, converts an analog transmitting electric signal into an acoustic signal under the drive of the matching network and the power amplifier and transmits the acoustic signal to an underwater acoustic channel.
The communication receiving apparatus includes: the device comprises a receiving and transmitting co-located transducer, a pre-filtering and amplifying device, an analog-digital converter, a synchronous detector, a synchronous pulse generator, a chaotic sequence generator, a copy generator, a channel equalizer, a chaotic demodulator and a data decoder. The chaotic sequence generator, the synchronous pulse generator, the transceiving transducer and the communication transmitting device are shared. Except for the co-located transducer, the other modules are inside the cylindrical elongated watertight tank.
The receiving and transmitting co-located transducer is positioned at the upper part of the cylindrical slender watertight tank and is responsible for acquiring underwater acoustic data, carrying out sound-electricity conversion and transmitting the data to the pre-filter and amplifier. The pre-filter and amplifier filters and amplifies the analog received signal and sends the signal to the A/D converter. The analog/digital converter converts the analog received signal into a digital signal, which is sent to the synchronous detector. The chaotic sequence generator generates chaotic sequences which are possibly used by all users in a channel through a chaotic mapping equation and sends the chaotic sequences to the replica generator and the synchronous pulse generator. The synchronous pulse generator generates a multi-user synchronous double-pulse copy consisting of linear frequency modulation pulses and chaotic frequency modulation phase modulation pulses according to a multi-user synchronous chaotic sequence provided by the chaotic sequence generator, and sends the multi-user synchronous double-pulse copy to the synchronous detector. The synchronous detector detects communication signals according to the multi-user synchronous double-pulse copies provided by the synchronous pulse generator, if the communication signals are detected, the synchronous detector sends data to the channel equalizer after synchronization, and sends corresponding user identifications to the copy generator. And the channel equalizer performs channel equalization on the communication signal and then sends the communication signal to the chaotic demodulator. The replica generator generates a corresponding multi-user grouping M-element spread spectrum replica set according to the chaotic sequence provided by the chaotic sequence generator and the user identification provided by the synchronous detector, and sends the set to the chaotic demodulator. The chaotic demodulator performs the related demodulation of the chaotic spread spectrum sequence according to the data provided by the channel equalizer and the multi-user grouping M-element spread spectrum replica set provided by the replica generator, generates the demodulated data and sends the demodulated data to the data decoder. And the data decoder decodes the demodulated data to generate receiving information and sends the receiving information to the data output device.
The data output apparatus includes: user discriminator, message mapper, audio coder and earphone. The user discriminator discriminates the data obtained by the communication receiving device, sends the voice data to the audio coder and sends the message data to the message mapper; the message mapper maps the message data content into a preset voice data stream and sends the preset voice data stream to the earphone for playing; the audio decoder performs real-time lossless voice compression decoding on the voice data and sends a decoded voice data stream to the earphone for playing; the earphones are arranged on two sides of the mask of the frogman and are shown in figure 1, and information received by the device is played. Except the earphone collecting device, other modules are arranged inside the cylindrical slender watertight tank.
The power and interface apparatus includes: a battery and power management module and a data interface module. The battery and power management module is arranged inside the cylindrical slender watertight tank and is responsible for power supply of the whole equipment. The data interface module is positioned at two ends of the cylindrical slender watertight tank, and the receiving and transmitting co-located transducer, the earphone, the microphone and the control module which are positioned outside the watertight tank are connected to the inside of the watertight tank through watertight connectors positioned on two end covers.
The portable underwater acoustic communication method for the frogman provided by the embodiment comprises a data input process, a communication transmitting process, a communication receiving process and a data output process, wherein the communication transmitting process comprises the following steps:
1) determining various transmitted parameters according to the user information obtained by the control module;
2) dividing communication coded data to be transmitted into data blocks of a group of K code elements;
3) obtaining a chaotic sequence according to a certain chaotic mapping relation, forming a chaotic frequency modulation value sequence mapping group and a chaotic phase modulation value sequence mapping group, and selecting a corresponding chaotic frequency modulation value sequence and chaotic phase modulation value sequence combination from the groups according to information contained in a data block;
4) generating a chaotic frequency modulation phase modulation spread spectrum signal set by combining a chaotic frequency modulation value sequence and a chaotic phase modulation value sequence, superposing all chaotic frequency modulation phase modulation spread spectrum signals in the chaotic frequency modulation phase modulation spread spectrum signal set into a group of concurrent chaotic frequency modulation phase modulation spread spectrum signals, and forming a chaotic frequency modulation phase modulation spread spectrum sequence by P groups of concurrent chaotic frequency modulation phase modulation spread spectrum signals;
5) generating synchronous double pulses according to user information, combining the synchronous double pulses with a chaotic frequency modulation phase modulation spread spectrum sequence, and finally transmitting;
the communication receiving process includes the steps of:
6) carrying out double-pulse user detection and coarse synchronization on the received data through a multi-user synchronous double-pulse copy;
7) then, channel equalization and fine synchronization are carried out on the detected user receiving data;
8) then, performing replica correlation with a multi-user grouped M-element spread spectrum replica set, detecting and judging, and recovering coding information according to a chaotic mapping relation;
9) the coded information is decoded, and the decoded information is converted by the user discriminator and the message mapper and then played by the earphone.
In the above technical solution, in the step 1), the user sets the message information sent to the water surface base through the control module, and the message information is as shown in table 1 and reflects the basic working state of the frogman under water. The parameters of the transmission include a transmission frequency range of 10 kHz-15 kHz, a transmission data rate of 20bps, user identification (1-255) and the like. Because the message communication between the frogman and the water surface base is characterized by long communication distance and low communication speed, a low frequency band and a narrow bandwidth are adopted.
TABLE 1 message Table
| Work by | Ready for use | Assistance system | Security | Calling for help |
| 1101 | 1011 | 1100 | 1010 | 0101 |
In the above technical solution, in the step 2), the communication encoded data to be transmitted is obtained by performing source coding and channel coding on original communication data. The source coding adopts Huffman coding and is used for removing redundant information; the channel coding adopts convolutional codes or turbo codes and is used for reducing the system error rate. And the communication encoded data is binary data. The value of K is 256-8912, the specific value depends on the adopted chaotic mapping model and the intersymbol interference level, and the divided data block is assumed to be (x)1，x2，K，xL) The sequence after source and channel coding is (c)1，c2，K，cK) Wherein L is the data length before encoding, and K is the data length after encoding.
In the above technical solution, in the step 3), the chaos is a deterministic but random-like process occurring in the nonlinear dynamic system, and this process is non-periodic, non-convergent but bounded, and extremely sensitive to the initial value. The quasi-random property of the chaotic sequence is very suitable for a spread spectrum modulation communication mechanism, and the chaotic mapping can provide a large amount of mutually orthogonal quasi-random and reproducible chaotic sequences because the chaotic mapping is extremely sensitive to initial values which are slightly different and can form mutually uncorrelated sequences. There are many chaotic mapping models, such as Quadratic mapping, Chebyshev mapping, Second-Order mapping, etc., and chaotic sequences obtained by different chaotic mapping models have different correlation characteristics. In this embodiment, a Quadratic mapping is adopted, and the Quadratic mapping equation can be expressed as:
g(m+1)＝P-Qg2(m) (1)
in this example, when 3/4 < PQ < 2, g (m) e (-2/Q, 2/Q), Q2, P1, g (0) e (-1, 1), and g (n) e (-1, 1) are taken.
Fig. 4 shows a chaotic sequence generated by the Quadratic mapping equation, the sequence length is 1024, the initial value is 0.8501, the autocorrelation characteristic is shown in fig. 5, and the autocorrelation sidelobe peak value is 0.0651; the cross-correlation characteristic is shown in fig. 6, the initial value of another chaotic sequence is 0.8564, and the cross-correlation peak value is 0.085.
The chaotic mapping process of the step 3) is to generate M groups of chaotic sequences which are mutually orthogonal from different initial values according to one or two chaotic mapping models, extract r chaotic sequences from the M groups of chaotic sequences and combine the chaotic sequences to obtain a combined number
So that the chaotic sequence combination and the information contained in the data block satisfy a one-to-one correspondence relationship, and the r value is conventionally 1-128.
In this embodiment, a chaos sequence obtained by using a chaos one-dimensional model is directly mapped into a frequency modulation value and a phase modulation value, as shown in fig. 7. Generating M groups of chaotic sequences by adopting the Quadratic mapping equation in the step 2) and recording the M groups of chaotic sequences as follows:
G1，G2，K，Gm，K，GM (2)
wherein,
is a chaotic sequence of length N
If the bandwidth range is B, the chaos frequency modulation value can be obtained by the formula:
thus, M groups of chaotic frequency modulation value sequences F can be obtained1，F2，K，Fm，K，FMAnd is and
obtaining a chaos phase modulation value by the same method:
thus, M groups of chaotic phase modulation value sequences omega can be obtained1，Ω2，K，Ωm，K，ΩMAnd is and
and according to the information contained in the data block, extracting r combinations from the M groups of chaotic frequency modulation values and phase modulation value sequences to obtain chaotic frequency modulation value and chaotic phase modulation value combinations:
(F，Ω)r＝[(Fm1，Ωm1)，K，(Fmr，Ωmr)] (5)
wherein the combination (m1, K, mr) consists of data block information (c)1，c2，K，cK) And (4) determining.
The information contained in the data block of step 3) is binary values corresponding to K symbols, and
the chaotic frequency modulation value sequences and the chaotic phase modulation value sequences are combined and in one-to-one correspondence.
In the above technical solution, in the step 4), the method for generating the concurrent chaotic frequency modulation phase modulation spread spectrum signal comprises the following steps: each group of chaotic frequency modulation value sequence and chaotic phase modulation value sequence combination comprises r chaotic frequency modulation value sequences and chaotic phase modulation value sequence pairs. And modulating according to the corresponding chaotic frequency modulation value and the corresponding chaotic phase modulation value pair in each sequence pair to obtain a chaotic frequency modulation phase modulation spread spectrum chip, wherein N chips form a chaotic frequency modulation phase modulation spread spectrum signal. And generating r chaotic frequency modulation phase modulation spread spectrum signals according to the combination of the chaotic frequency modulation value and the chaotic phase modulation value which are correspondingly obtained according to the information so as to form a chaotic frequency modulation phase modulation spread spectrum signal set.
The expression of the chaotic frequency modulation phase modulation spread spectrum signal is as follows:
sm(t)＝Acos[ω0t+∫cm(t)dt+km(t)]0≤t≤T (6)
wherein A is the signal amplitude, omega0＝2πf0Is the center angular frequency, f0As the center frequency, c (t) is a frequency modulation function, having:
here, ξn(t)＝u[t-nT0]-u[t-(n+1)T0]Is of duration T0U (t) is a step function,
N＝T/T0。
therefore, the r chaotic frequency modulation phase modulation spread spectrum signals are mutually superposed to form a group of concurrent chaotic frequency modulation phase modulation spread spectrum signals. The expression is as follows:
wherein s ismi(t) combining the chaos frequency modulation value and chaos phase modulation value (F, omega)rAnd (4) obtaining.
P groups of concurrent chaotic frequency modulation phase modulation spread spectrum signals are sequentially arranged to form a chaotic frequency modulation phase modulation spread spectrum sequence, namely:
wherein, tau is a group of pulse widths of the concurrent chaotic frequency modulation phase modulation spread spectrum signals.
Thus, a chaotic fm-phase spreading sequence contains K × P binary symbols.
In the above technical solution, in the step 5), the synchronization double pulse is composed of a chirp pulse and a chaos frequency modulation phase modulation pulse, the chirp pulse is mainly used for signal detection, and the chaos frequency modulation phase modulation pulse is mainly used for identifying a transmitting user and performing coarse synchronization. The chirp pattern is unique and is the same for each device. The chaos frequency modulation value and phase modulation value sequence corresponding to the chaos frequency modulation phase modulation pulse is determined by equipment, and one equipment corresponds to a group of unique chaos frequency modulation value and phase modulation value sequence which are mutually orthogonal signals with other chaos frequency modulation phase modulation spread spectrum signals. When the synchronization dipulse and the chaos frequency modulation phase modulation spreading sequence are combined, a fixed interval T (as shown in fig. 3) exists between them to avoid signal crosstalk caused by channel spreading. The mathematical expression of the final transmitted signal is:
wherein synLFM(t) is a chirp, τLFMIs its pulse width;
for chaotic frequency-modulated phase-modulated pulses, tauCHFor its pulse width, the ID represents the corresponding identification of the device.
In the above technical solution, in the step 6), the method for detecting and coarsely synchronizing the dipulse users is as follows (as shown in fig. 8): firstly, performing copy correlation detection on received data through a linear frequency modulation pulse copy; if the communication signals exist through peak detection, replica correlation detection is carried out through the chaotic frequency modulation phase modulation pulse replicas (corresponding to Q possible users, Q corresponding chaotic frequency modulation phase modulation pulse replicas are generated, Q times of replica correlation is carried out, the obtained peak is subjected to threshold detection, and the corresponding user identification is detected). Because the chaotic frequency modulation and phase modulation pulses are mutually orthogonal, the number of detected users can be more by double-pulse detection. The mathematical principle is as follows:
if an ideal channel is set, the expression of the communication received data is as follows:
where n (t) is a noise signal.
First, rep is replicated by chirpLFM(t) performing duplicate correlation detection, namely:
d(t)＝∫r(t)*repLFM(t-τ)dτ (13)
since the chirp replica is orthogonal to the noise signal, by peak detection:
where D is the detection threshold. If the existence of communication signals is detected through correlation of the linear frequency modulation pulse copies, Q possible users correspond to the chaotic frequency modulation phase modulation pulse copies
Q ═ 1, Λ, Q, perform Q replica correlations, i.e.:
because the chaotic frequency modulation phase modulation pulse copies are orthogonal and the noise signals are orthogonal, the peak value detection is adopted:
the users possibly existing in the received data can be detected, because each user shares one channel in the underwater sound channel, the possibility that more than two users arrive at the communication receiving device at the same time or with small gap exists in time, therefore, the detected user number W is generally 1, and the situation that the detected user number is more than 1 is existed at the same time, which is related to the distance between each user and the surface base and the communication busy degree, if the distance is close or the communication is busy, the detected user number is more.
According to step 5), because a fixed interval T exists between the synchronous double pulses and the chaotic frequency modulation phase modulation spread spectrum sequence during signal transmission, coarse synchronization can be carried out through a correlation peak value detected by the correlation of a chaotic frequency modulation phase modulation pulse replica, and the initial position of the chaotic frequency modulation phase modulation spread spectrum sequence is marked, namely:
because the chaotic frequency modulation and phase modulation pulses are mutually orthogonal, the initial positions of the chaotic frequency modulation and phase modulation spread spectrum sequences of different users can be marked by different detected user related peak values.
In the above technical solution, in the step 7), the channel equalization method uses RLS equalization or turbo equalization to reduce or remove the influence of the underwater acoustic channel.
In the above technical solution, in the step 8), the multi-user packet M-ary spread spectrum replica set is generated according to the user identifier detected in the step 6) and the corresponding processes in the steps 3) and 4). And if the number of the detected users is W, generating W-M groups of chaotic frequency modulation phase modulation spread spectrum replica signals.
Each group of replica signals is respectively replica-correlated with the received data:
since the spread spectrum signals are orthogonal to each other, the peak value is detected by the maximum likelihood to obtain:
mapping combination (m1, K, mr) of corresponding user w can be respectively detected according to the detected peak valueswAs shown in fig. 9. Each mapping combination recovers the coding information according to the chaotic mapping relation obtained in the step 2) (c)1，c2，K，cK)|w。
In the above technical solution, in the step 9), the channel decoding method adopts a Turbo algorithm or a Viterbi algorithm, and then performs source decoding to recover the communication information (x)1，x2，K，xL)|w。
For each user, the received message can be converted into a voice data stream through a user discriminator and a message mapper and is sequentially played by the earphone; and can also be displayed on the monitoring equipment of the water surface base in a graphic display mode.
Example 2
The portable communication sonar equipment for short-range real-time communication in an underwater frogman provided by the present embodiment is the same as that of embodiment 1, as shown in fig. 1. This embodiment will describe a process of performing voice communication between frogmans through the utility model apparatus.
The process of performing M-ary spread spectrum multi-user communication by using a chaos frequency modulation and phase modulation sequence provided by this embodiment includes a communication transmitting process and a communication receiving process, where the communication transmitting process includes the following steps:
1) determining various transmitted parameters according to the user information obtained by the control module, obtaining voice data stream by a microphone, and converting the voice data stream by an audio encoder;
2) dividing communication coded data to be transmitted into data blocks of a group of K code elements;
3) obtaining a chaotic sequence according to a certain chaotic mapping relation, forming a chaotic frequency modulation value sequence mapping group and a chaotic phase modulation value sequence mapping group, and selecting a corresponding chaotic frequency modulation value sequence and chaotic phase modulation value sequence combination from the groups according to information contained in a data block;
4) generating a chaotic frequency modulation phase modulation spread spectrum signal set by combining a chaotic frequency modulation value sequence and a chaotic phase modulation value sequence, superposing all chaotic frequency modulation phase modulation spread spectrum signals in the chaotic frequency modulation phase modulation spread spectrum signal set into a group of concurrent chaotic frequency modulation phase modulation spread spectrum signals, and forming a chaotic frequency modulation phase modulation spread spectrum sequence by P groups of concurrent chaotic frequency modulation phase modulation spread spectrum signals;
5) generating synchronous double pulses according to user information, combining the synchronous double pulses with a chaotic frequency modulation phase modulation spread spectrum sequence, and finally transmitting;
the communication receiving method comprises the following steps:
6) carrying out double-pulse user detection and coarse synchronization on the received data through a multi-user synchronous double-pulse copy;
7) then, channel equalization and fine synchronization are carried out on the detected user receiving data;
8) then, performing replica correlation with a multi-user grouped M-element spread spectrum replica set, detecting and judging, and recovering coding information according to a chaotic mapping relation;
9) the coded information is decoded, and the decoded information is converted by the user discriminator and the audio decoder and then played by the earphone.
In the above technical solution, in the step 1), the user sets a voice communication mode, generally a broadcast mode, between frogmans through the control module. The parameters of the transmission include a transmission frequency range of 15 kHz-25 kHz, a transmission data rate of 8kbps, user identification (1-255) and the like. Since voice communication between frogmans is characterized by a short communication distance and a high communication rate, a high frequency band and a high bandwidth are used.
In the above technical solution, the remarks of the steps 2) to 8) are the same as in the embodiment 1.
In the above technical solution, in the step 9), the channel decoding method is the same as that in the embodiment 1. For each user, the voice data stream is converted by a user discriminator and an audio decoder and is played by the earphone in sequence.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (3)
1. A portable underwater acoustic communication device for frogs, comprising a data input device, a communication transmitting device, a communication receiving device, a data output device, and a power supply and interface device connected to each device, characterized in that: the data input device collects voice signals, the voice signals are sent to the communication transmitting device after being compressed and coded, the communication transmitting device converts the received signals into acoustic signals and sends the acoustic signals to the underwater sound channel, the acoustic signals in the underwater sound channel are collected by the communication receiving device and then converted into electric signals to be sent to the data output device, and the data output device converts the electric signals and plays the electric signals through an earphone;
the data input device comprises a microphone, an audio encoder and a control module, the audio encoder performs real-time lossless voice compression encoding on voice signals collected by the microphone and sends the voice signals to the communication transmitting device, and the control module sets instructions through a knob to control the communication transmitting device;
the communication transmitting apparatus includes: the device comprises a parameter selector, a user mapper, a data coder, a data packetizer, a chaotic sequence generator, a chaotic mapper, a chaotic modulator, a synchronous pulse generator, a waveform generator, a transmission conversion and control module, a matching network, a power amplifier and a transceiving co-located transducer; the parameter selector selects the frequency band and the data rate matched with the type of the transmitted information according to the instruction provided by the control module, and the frequency band and the data rate are respectively provided for the user mapper and the data encoder; the user mapper selects the chaotic parameters matched with the user according to the parameters provided by the parameter selector and sends the chaotic parameters to the chaotic mapper and the chaotic sequence generator; the data encoder performs source coding and channel coding on the message instruction provided by the control module or the voice data provided by the audio encoder according to the parameters provided by the parameter selector; the data packetizer packetizes the data stream sent by the data encoder and sends the data stream to the chaotic modulator; the chaotic sequence generator generates chaotic sequences determined by different initial values through a chaotic mapping equation according to parameters provided by a user mapper and sends the chaotic sequences to the chaotic mapper and the synchronous pulse generator; the chaotic mapper maps the chaotic sequence generated by the chaotic sequence generator according to the parameters provided by the user mapper to generate a chaotic frequency modulation value sequence mapping packet and a chaotic phase modulation value sequence mapping packet which are orthogonal to each other and send the packets to the chaotic modulator; the chaotic modulator carries out grouped M-element chaotic spread spectrum modulation according to the chaotic frequency modulation value sequence mapping grouping and the chaotic phase modulation value sequence mapping grouping provided by the chaotic mapper, modulates the data grouping provided by the data grouper into a transmission data block and sends the transmission data block to the waveform generator; the synchronous pulse generator generates synchronous double pulses consisting of linear frequency modulation pulses and chaotic frequency modulation phase modulation pulses according to a user synchronous chaotic sequence provided by the chaotic sequence generator and sends the synchronous double pulses to the waveform generator; the waveform generator combines the transmitting data block provided by the chaotic modulator and the synchronous double pulses provided by the synchronous pulse generator to generate a final communication transmitting signal, and sends the final communication transmitting signal to the transmitting conversion and control module; the transmission conversion and control module carries out digital-to-analog conversion and transmission conditioning on the communication transmission signal and sends the analog transmission signal and the transmission parameters to the matching network and the power amplifier; the matching network and the power amplifier are driven by the transmission conversion and control module to amplify and match the power of the analog transmission signal; the receiving and transmitting co-located transducer is positioned at the upper part of the cylindrical slender watertight tank, converts an analog transmitting signal into an acoustic signal under the drive of the matching network and the power amplifier and transmits the acoustic signal to an underwater acoustic channel;
the communication receiving device comprises a transceiving transducer, a pre-filtering and amplifying device, an analog/digital converter, a synchronous detector, a synchronous pulse generator, a chaotic sequence generator, a copy generator, a channel equalizer, a chaotic demodulator and a data decoder; the receiving and transmitting co-located transducer is responsible for acquiring underwater acoustic data, carrying out sound-electricity conversion and sending the underwater acoustic data to the pre-filter and amplifier; the pre-filter and amplifier filters and amplifies the analog receiving signal and sends the analog receiving signal to the analog-to-digital converter; the analog/digital converter converts an analog receiving signal into a digital signal and sends the digital signal to the synchronous detector; the chaotic sequence generator generates chaotic sequences which are possibly used by all users in a channel through a chaotic mapping equation and sends the chaotic sequences to the replica generator and the synchronous pulse generator; the synchronous pulse generator generates a multi-user synchronous double-pulse copy consisting of linear frequency modulation pulses and chaotic frequency modulation phase modulation pulses according to a multi-user synchronous chaotic sequence provided by the chaotic sequence generator and sends the multi-user synchronous double-pulse copy to the synchronous detector; the synchronous detector detects communication signals according to the multi-user synchronous double-pulse copies provided by the synchronous pulse generator, if the communication signals are detected, the synchronous detector sends data to the channel equalizer after synchronization, and sends corresponding user identifications to the copy generator; the channel equalizer performs channel equalization on the communication signal and then sends the communication signal to the chaotic demodulator; the replica generator generates a corresponding multi-user grouping M-element spread spectrum replica set according to the chaotic sequence provided by the chaotic sequence generator and the user identification provided by the synchronous detector, and sends the set to the chaotic demodulator; the chaotic demodulator performs related demodulation of a chaotic spread spectrum sequence according to data provided by the channel equalizer and a multi-user grouping M-element spread spectrum replica set provided by the replica generator, generates demodulated data and sends the demodulated data to a data decoder; the data decoder decodes the demodulated data to generate receiving information and sends the receiving information to the data output device;
the data output device comprises a user discriminator, a message mapper, an audio coder and an earphone, wherein the user discriminator discriminates data obtained by the communication receiving device, sends voice data to the audio coder and sends message data to the message mapper; the message mapper maps the message data content into a preset voice data stream and sends the preset voice data stream to the earphone for playing; and the audio decoder performs real-time lossless voice compression and decoding on the voice data and sends the decoded voice data stream to the earphone for playing.
2. A frogman portable underwater acoustic communication apparatus as claimed in claim 1, wherein: the communication transmitting device and the communication receiving device share the chaotic sequence generator, the synchronous pulse generator and the transceiving transducer.
3. A frogman portable underwater acoustic communication apparatus as claimed in claim 1, wherein: the equipment main part comprises long and thin watertight jar, frogman's face guard and frogman waistband triplex, and the triplex passes through the cable connection, earphone and microphone are installed on frogman's face guard, control module sets up on the frogman waistband, power and interface module set up on long and thin watertight jar, the receiving and dispatching transducer setting is put altogether at the top of long and thin watertight jar.
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| CN2010205538183U CN201846340U (en) | 2010-10-09 | 2010-10-09 | Portable underwater acoustic communication device for frogman |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969348A (en) * | 2010-10-09 | 2011-02-09 | 苏州桑泰海洋仪器研发有限责任公司 | Portable underwater acoustic communication equipment and method for frogman |
| CN103513252A (en) * | 2013-09-30 | 2014-01-15 | 哈尔滨工程大学 | Portable acoustic image observing system |
| CN107567413A (en) * | 2015-04-21 | 2018-01-09 | 戴卡特隆有限公司 | It is fitted with the diving mask of communicator |
| CN111260889A (en) * | 2020-02-27 | 2020-06-09 | 厦门大学 | Safety monitoring management device for underwater operation of diver |
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2010
- 2010-10-09 CN CN2010205538183U patent/CN201846340U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969348A (en) * | 2010-10-09 | 2011-02-09 | 苏州桑泰海洋仪器研发有限责任公司 | Portable underwater acoustic communication equipment and method for frogman |
| CN101969348B (en) * | 2010-10-09 | 2013-06-19 | 苏州桑泰海洋仪器研发有限责任公司 | Portable underwater acoustic communication equipment and method for frogman |
| CN103513252A (en) * | 2013-09-30 | 2014-01-15 | 哈尔滨工程大学 | Portable acoustic image observing system |
| CN103513252B (en) * | 2013-09-30 | 2015-12-02 | 哈尔滨工程大学 | A kind of portable acoustics image viewing system |
| CN107567413A (en) * | 2015-04-21 | 2018-01-09 | 戴卡特隆有限公司 | It is fitted with the diving mask of communicator |
| US11667362B2 (en) | 2015-04-21 | 2023-06-06 | Decathlon | Diving mask provided with a telecommunications device |
| CN111260889A (en) * | 2020-02-27 | 2020-06-09 | 厦门大学 | Safety monitoring management device for underwater operation of diver |
| CN111260889B (en) * | 2020-02-27 | 2021-11-30 | 厦门大学 | Safety monitoring management device for underwater operation of diver |
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